Diablosport Forums

Just got my trinity and did the software update. Went out and attached to my 2000 GMC Yukon XL. I am going in circles getting now where. Everytime I try and program, It decides it can get the VIN PCM or Can't Communicate either.

I also think I get a message in there about compatibility.

What's the scoop? What am I doing wrong? Very frustrating.

Also, I bought this because I tow a lot. Which tune would you recommend?

Thanks!

Anything aftermarket installed in the truck? i.e did not come from the factory?

make sure anything aftermarket is disconnected/pull the fuse for - anything like aftermarket stereo, subs, amps, nav, alarm, remote start, seat heaters, trailer brake/light setup, etc.. anything like that, their wiring harnesses need to be disconnected/pull the fuses for it before you try to tune anything...

also make sure everything is turned off inside the truck.. lights, radio, heat/fan/blower, do not operate power windows, put your parking brake on, etc...

It has a remote starter. I do notice that when it tried to go program, the GM security light starts blinking. Maybe I switch to the 2004.

you need to disconnect the remote start system